---
product_id: 343962586
title: "Optimum Nutrition Serious Mass Protein Powder High Calorie Weight Gainer with Vitamins, Minerals, Creatine and Glutamine, Chocolate Peanut Butter Flavour, 16 Servings, 5,45 kg"
brand: "optimum nutrition"
price: "€ 84.27"
currency: EUR
in_stock: false
reviews_count: 5
url: https://www.desertcart.ie/products/343962586-optimum-nutrition-serious-mass-protein-powder-high-calorie-weight-gainer
store_origin: IE
region: Ireland
---

# 3g creatine boost 50g protein/serving 1250+ calories/serving Optimum Nutrition Serious Mass Protein Powder High Calorie Weight Gainer with Vitamins, Minerals, Creatine and Glutamine, Chocolate Peanut Butter Flavour, 16 Servings, 5,45 kg

**Brand:** optimum nutrition
**Price:** € 84.27
**Availability:** ❌ Out of Stock

## Summary

> 🚀 Bulk smarter, not harder with Serious Mass!

## Quick Answers

- **What is this?** Optimum Nutrition Serious Mass Protein Powder High Calorie Weight Gainer with Vitamins, Minerals, Creatine and Glutamine, Chocolate Peanut Butter Flavour, 16 Servings, 5,45 kg by optimum nutrition
- **How much does it cost?** € 84.27 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.ie](https://www.desertcart.ie/products/343962586-optimum-nutrition-serious-mass-protein-powder-high-calorie-weight-gainer)

## Best For

- optimum nutrition enthusiasts

## Why This Product

- Trusted optimum nutrition brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Calorie Powerhouse:** Fuel your gains with a massive 1250+ calories per serving—because average just won’t cut it.
- • **Clean & Nutrient-Rich:** No added sugar, less than 5g fat, plus 24 essential vitamins and minerals for holistic health.
- • **Versatile & Delicious:** Instantised powder blends effortlessly—mix with fruit or nut butters for a crave-worthy, calorie-dense shake.
- • **Muscle-Building Protein:** 50 grams of premium protein to support serious muscle growth and recovery.
- • **Creatine-Enhanced Performance:** 3 grams of creatine per serving to amplify your high-intensity workouts.

## Overview

Optimum Nutrition Serious Mass is a high-calorie weight gainer designed for adults aiming to bulk up efficiently. Each serving delivers over 1250 calories, 50g of protein, 3g creatine, and 24 vitamins and minerals, with no added sugar and minimal fat. Its instantised formula mixes easily and supports muscle growth, recovery, and enhanced workout performance, making it a top choice for serious fitness enthusiasts.

## Description

The transformation is part of Optimum Nutrition mission to help active individuals better understand OPTIMUM NUTRITION products and how they support their goals. A Serious Mass new formula is now enriched with 3g Creatine per serving to support your performance*.Struggling to gain muscle mass? Serious Mass is a quality whey protein powder designed to support muscle building**. Help yourself bulk up! With a great range of flavours, the high-protein drink powder from Optimum Nutrition contains 1,260+ calories, 50 g of protein, 250 g+ of carbohydrates, 3 g of Creatine, Glutamine plus 24 vitamins and minerals per serving when mixed with water. It’s made with no added sugar and less than 5 g of fat per serving! Blend the quality protein with fruit or nut butters for extra calories and discover your optimum taste combination. Use after intense training and between meals. Serious Mass has the highest number of calories from Optimum Nutrition’s line of mass gainers. The instantised powder is available in 6 LB and 12 LB tubs. One serving contains two heaped scoops of powder.*Creatine increases physicalperformance in successivebursts of short-term, highintensity exercise. Source: Official Journal of the European Union - COMMISSION REGULATION (EU) No 432/2012**Protein contributes to agrowth and maintenance of muscle mass. Source: Official Journal of the European Union - COMMISSION REGULATION (EU) No 432/2012.

Review: Ottimi effetti e gusto davvero piacevole. Richiede un po’ più tempo per sciogliersi in acqua, ma le porzioni sono abbondanti e soddisfacenti.
Review: Es de muy buena calidad y precio

## Features

- Packaging may vary: Ideal look, with the same trusted quality
- Mass gainer with whopping 1250 calories and 50 g of protein per serving. Contains less than 5 g fat
- Comes as an instantised powder. Mix with fruit or nut butters for a tasty and calorific post-workout drink or take between meals to encourage muscle growth
- Proudly contains no added sugar: Boasts 24 vitamins and minerals per serving
- Ideal value for money. Serious mass protein powder delivers a high-calorie content and quality protein at competitive rates
- Provides calories, encouraging weight gain and refuels body’s glycogen stores

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B015WMRVKW |
| ASIN  | B015WMRVKW |
| Age Range Description | Adult |
| Allergen Information | Milk, Soy, Wheat |
| Best Sellers Rank | #39,849 in Health ( See Top 100 in Health ) #1,639 in Sports Supplements #12,264 in Vitamins, Minerals & Supplements |
| Brand | Optimum Nutrition |
| Country of origin | gb |
| Customer Reviews | 4.5 4.5 out of 5 stars (5,575) |
| Customer reviews | 4.5 4.5 out of 5 stars (5,575) |
| Date First Available | 27 October 2015 |
| Format | Powder |
| Is Discontinued By Manufacturer  | No |
| Item model number  | 1101534 |
| Manufacturer  | Glanbia Performance Nutrition |
| Product Dimensions  | 30 x 14 x 42 cm; 5.45 kg |
| Product Name | HEALTH_PERSONAL_CARE |
| Serving Recommendation | One Scoop |
| Storage Instructions | In a cool, dry place |
| Units | 5450.0 Grams |
| Weight | 5440 Grams |

## Product Details

- **Brand:** Optimum Nutrition
- **Flavour:** Chocolate Peanut Butter
- **Item weight:** 5.45 Kilograms
- **Material type free:** Sugar Free
- **Servings per container:** 16

## Images

![Optimum Nutrition Serious Mass Protein Powder High Calorie Weight Gainer with Vitamins, Minerals, Creatine and Glutamine, Chocolate Peanut Butter Flavour, 16 Servings, 5,45 kg - Image 1](https://m.media-amazon.com/images/I/71L6x8SDfjL.jpg)

## Available Options

This product comes in different **Size, Flavor** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by A***N on 12 October 2025*

Ottimi effetti e gusto davvero piacevole. Richiede un po’ più tempo per sciogliersi in acqua, ma le porzioni sono abbondanti e soddisfacenti.

### ⭐⭐⭐⭐⭐ Review
*by M***A on 15 October 2025*

Es de muy buena calidad y precio

### ⭐⭐⭐⭐⭐ Review
*by J***T on 10 April 2021*

Like the flavour.

## Frequently Bought Together

- Optimum Nutrition Serious Mass Protein Powder High Calorie Mass Gainer with Vitamins, Creatine and Glutamine, Chocolate Peanut Butter, 16 Servings, 5.45 kg, Packaging May Vary
- Optimum Nutrition Micronised Creatine Powder, 100% Pure Creatine Monohydrate Powder for Performance and Muscle Power, Unflavoured Shake, 186 Servings, 634 g
- Warrior Protein Shaker Bottle, Includes Wire Mixball Blender – 600ml – Perfect for Mixing Powdered Shakes, Clear, BPA Free, Dishwasher Safe

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*Product available on Desertcart Ireland*
*Store origin: IE*
*Last updated: 2026-03-02*